nr_pdcp_entity_recv_sdu() processes PDCP SDUs, and forwards the PDU at the
end of the function, while having the PDCP lock. This can lead to
deadlocks, e.g., when another thread goes through RLC and tries to
access the PDCP while the PDCP tries to lock the RLC.

This commit changes the logic: instead of having recv_sdu() forward the
PDU directly, it fills a buffer with the PDU (thus the name change to
process_sdu()), and returns. We then unlock the PDCP, before forwarding
the PDU, thus eliminating potential deadlocks.

Creates function that have nr_pdcp_ prepended to their name, and change
the signature of some functions for the 5G PDCP:

- nr_pdcp_layer_init()
- nr_pdcp_data_req()
- nr_pdcp_remove_UE()
- nr_pdcp_config_set_security()
- nr_pdcp_remove_UE()
- Make separate functions for nr_pdcp_data_req_srb/drb()

integration_2023_w12

See merge request oai/openairinterface5g!2030

* !1957 UL improvements for 2-layers
* !2016 int32_t to c16_t conversion
* !2028 Fix ue capability config files
* !2022 NR dlsim pmi input
* !2027 limiting SR periodicity according to scs
* !1985 Correct F1 RRC Message Transfer
* !2024 harmonize mac_CellGroupConfig RRC configuration
* !2026 Fix build by installing nrscope dependencies

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Add CI test: 3GPP G-FR1-A4-27, PUSCH Type B, 40 MHz BW, 30 kHz SCS, 2 RX Antennas Requirements Test, 2 layers

The message is never sent to the RRC. And this message is to be
forwarded by the DU to the UE, hence it should not even be handled by
the RRC (as the RRC in the CU sends it).

The RRC container is transparent for the DU. Hence, we should not decode
it.

During the Initial UL RRC Message, the CellGroup is created. Since the
CellGroup specifies the SRB1, the SRB1 should also be created (because
the DL RRC Messages is sent via SRB1). However, before this commit, the
CellGroup is created while having the RLC lock, so we cannot create
SRB1, as it results in a deadlock.

Therefore, we now first create CellGroup, SRB0, and SRB1, before giving
the UE message to the RLC.

integration_2023_w11b

See merge request oai/openairinterface5g!2020

* !1833 NR ULSCH transform precoding improvements
* !1929 Implementing bands greater than 64 in the code, feature #603
* !1982 Rework ngap
* !1998 Update NR RRC to version 17.3.0
* !2003 improve NR UE state machine
* !2007 possibility to set identity precoding matrix from config file
* !2009 Use same configurable port number for local and remote N3
* !2012 fix unaligned IDFT
* !2013 doc(tutorial): switching to jinja-rendering configuration on the OAI-CN5 containers
* !2018 demote two UL scheduler warnings to debug level